For discussions of MSL changes and extreme sea levels around Namibia and South Africa, see: G.B.Brundrit, S.Afr.J.Mar.Sci.,16,9-17,1995 and S.Searson and G.B.Brundrit, S.Afr.J.of Science, 91,579-588,1995. 1958 - 1972 values based on 8 readuings per day; Reference BM disturbed in 1964, exact relationship between level of this BM and replacement BM is uncertain.Data for 1966 very suspect and deleted.
Documentation added 2000-05-23
BM LUD1 installed April 1998 at 2.394m above MSL. MSL=LLD. BM Tide Gauge Pit = MSL+2.156m.
Documentation added 2009-09-24
Heights of chart datum relative to land levelling datum in South Africa and Namibia: Luderitz Datum: up to 31st Dec 1993= -0.865 Datum: 1st Jan 1994 - 31st Dec 1997 = -0.900 Datum: 1st Jan 1998 - 31st Dec 2002 = -0.935 Datum: 1st Jan 2003 onwards = -1.055 Datum is now LAT so unlikely to change.
Documentation added 2010-05-11
The annual value for 2009 appears high this is probably because there are several large gaps in the previous data.
Documentation added 2017-03-01
The tide gauge station at Luderitz has been out of action for most of 2016 consequently there are no monthly means available for 2016. The Namibian authority is in the process of upgrading the system.
Documentation added 2019-11-07
The South African Navy Hydrographic Office (SANHO) are the copyright owners of the Luderitz sea level data and must be contacted to request permission to use the data.
Documentation added 2021-02-10
"The South African Hydrographic Office have asked us to remove this record in line with the Hydrographic Act of 2019 (Act No. 35 of 2019) and the South African Spatial Data Infrastructure Act, 2003 (Act No. 54 of 2003). The data can be obtained directly from SANHO (email: firstname.lastname@example.org)
Hydrographic Office Maritime Headquarters Private Bag X1 Tokai 7966